package com.atguigu.educenter.controller;

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

//@CrossOrigin
@Controller     //只是请求地址,不需要返回数据
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //2 获取扫描人信息,添加数据
    @GetMapping("callback")
    public String callback(String code,String state){

        try {
            //1 获取code值,临时票据,类似于验证码

            //2 拿着code请求 微信固定地址,得到两个值accsess_token和openid
            //向认证服务器发送请求换取access_token
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数:id 密钥和code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
            //请求这个拼接好的地址,得到返回两个值access_token和openid
            //使用httpclient发送请求,得到返回结果
            String accessTokenUrlInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo字符串获取出来两个值access_token和openid
            //把accessTokenInfo字符串转换成map集合,根据map里面key获取对应值
            //使用json转换工具Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenUrlInfo, HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");



            //把扫描人信息添加到数据库里面
            //判断数据表里面是否存在相同微信信息,根据openid判断
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member == null) {   //member是空,表没有相同卫星数据,进行添加
                //3 拿着得到的access_token和openid,再去请求微信服务提供固定的地址,获取到扫描人信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取返回userInfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userInfoMap.get("nickname"); //昵称
                String headimgurl = (String) userInfoMap.get("headimgurl"); //头像

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }

            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //最后:返回首页面,通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        } catch (Exception e) {
            e.printStackTrace();
            throw new GuliException(20001, "登陆失败");
        }

    }

    //1 生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode() {

        //固定地址,后面拼接参数
//        String url = "https://open.weixin.qq.com/connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+
//                "&response_type=code";

        // 微信开放平台授权baseUrl
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl=URLEncoder.encode(redirectUrl, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        //设置%s里面的值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );


        //重定向到请求微信地址里面
        return "redirect:"+url;
    }
}
